your rear wiper feeds off of your main reservoir in the engine compartment .. if you are not getting any fluid to the back take a look on the driver side in the engine compartment there is a T joint tube that joins the rear to the front ..sometimes it comes off .

Well if thats not the goofist thing ??? if the hose had a leak then my tank would drain, I don't have that issue my front sprayers work fine. OK so where is the pump is it trying to push fluid some 20 plus feet or is it drafting it 20 plus feet?